I have got another pic from the buttom.That shows how I fix the trays:3 CF tubes in each side.
The trays are the combintion of TF trays and my customized Al tray which I planed to be my battery trays in the beginning.
They are stronger and of easy access.
The transmission is a little off the center line of the truck.This gives me annoying trubles about the mounting of the center shafts.
I have to file the interferent spot of the chassis and the shafts.